Method for providing an inorganic coating to ammonium nitrate-based particles
US10167236B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 3, 2015 |
| Grant date | Jan 1, 2019 |
| Priority date | — |
| Expiry date | Jun 6, 2035 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09D1/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The invention relates to a method for providing an inorganic coating to ammonium nitrate (AN) based particles, in particular to ammonium nitrate-based particles for use as a fertilizer, as well as to an inorganic coating for ammonium nitrate-based particles per se. The method comprises the steps of: a) applying a liquid concentrated mineral acid with a water content of less than 50 weight %, to the particles, in order to at least solubilize ammonium nitrate at the outer surface of the particles such that an acidified particle grasping layer is obtained, and b) applying a solid mineral alkaline in powder form to the particles of step a) in order to react with the grasping layer of the particles to coat the acidified particle surface; wherein the stoichiometric ratio of solid mineral alkaline in powder form to concentrated mineral acid is equal to or more than 5:1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.